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Algebra/unitary method

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Question
95 men had provisions for 200 days.After 5 days 30 men died due to an epidemic.The remaining food will last for how many days?

Answer
If 95 men had provisions for 200 days, that meants they had 200*95 days of food.
200*95 is 19,000.  They used up 5 days, so 5*95 = 475.

The total food was 19,000, and they used 475, so they have left 19,000 - 475 = 18,525.

Since there are now 5 less men, there are 95 - 5 = 90 men left with 18,525 days of food.

(18,525 days of food)/(90 men) = 205 5/6 days after the 5 days have passed.

Algebra

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Scott A Wilson

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